A method and a system are disclosed for function control using a display unit including a touch area and a non-touch area. The device includes an output area for displaying various types of screen data corresponding to execution applications, a control area for providing a graphical user interface (GUI) for controlling a function of the device, and a control unit for detecting execution of a particular application, configuring a screen comprising the output area and the control area in response to the executed application, and controlling a function of the device according to a user interaction occurring through the GUI in the control area.